/**
 * Copyright (c) 2012-2016, www.tinygroup.org (luo_guo@icloud.com).
 *
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.gnu.org/licenses/gpl.html
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.tinygroup.weblayer.filter.gzip;

import org.tinygroup.logger.Logger;
import org.tinygroup.logger.LoggerFactory;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

public class GZIPResponseWrapper extends HttpServletResponseWrapper {
    protected ByteArrayOutputStream baos = new ByteArrayOutputStream();
    protected PrintWriter writer = null;

    private Logger logger = LoggerFactory.getLogger(GZIPResponseWrapper.class);

    public GZIPResponseWrapper(HttpServletResponse response) {
        super(response);
    }

    public ServletOutputStream getOutputStream() throws IOException {
        return new GZIPResponseStream(baos);
    }

    public PrintWriter getWriter() throws IOException {
        writer = new PrintWriter(new OutputStreamWriter(baos,
                super.getCharacterEncoding()));
        return writer;
    }

    public byte[] getBufferedBytes() {
        try {
            if (writer != null) {
                writer.close();
            }
            baos.flush();
        } catch (IOException e) {
            logger.errorMessage(e.getMessage(), e);
        }
        byte[] byteArray = baos.toByteArray();
        return byteArray;
    }

}
